Polymer Valley Chemicals mineral fillers, carbon black, reinforcing fillers, rubber and plastic compounding, un-treated mineral fillers, treated mineral fillers, toll conversion, pre-weigh, ASTM Grades, Furnace Black, Thermal Black, N990, treated hydrous clays, silane treated clays, calcined clays, precipitated silica, fumed silica, low-melt, Kaolin Clay, Silica, ATH, MgOH, color characterization, sulfur determination, carbon determination, ash content, volatiles, pH, sieve residue Polymer Valley Chemicals, Inc. has been a leader in mineral fillers, carbon black and custom treating & packaging for more than two decades. Founded in Akron, Ohio in …